Restructuring and Other Costs (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Restructuring Cost and Reserve [Line Items]
Total restructuring and other costs	$ 29	$ 0	$ 29	$ 0
Total estimated costs			80
Individual Life [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and other costs	7		7
Total estimated costs			22
Retirement Plans [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and other costs	4		4
Total estimated costs			14
Mutual Funds [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and other costs	1		1
Total estimated costs			4
Runoff Operations [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and other costs	3		3
Total estimated costs			11
Other [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and other costs	14		14
Total estimated costs			$ 29